Effects of titanium concentration and tungsten addition on the nano-mesoscopic structure of high-Cr oxide dispersion strengthened (ODS) ferritic steels

To study the effects of titanium concentration and tungsten addition on the nano-mesoscopic structure of high-Cr oxide dispersion strengthened (ODS) ferritic steels, the spatial and size distributions, shape, and coherency of the oxide particles in SOC-5 (Fe–15.95Cr–0.09Ti–0.34Y2O3) and SOC-P3 (Fe–13.32Cr–1.9W–0.16Ti–0.33Y2O3) were studied by diffraction contrast techniques, including weak beam electron microscopy. When the titanium concentration is increased from 0.09 to 0.16wt.% with 1.9wt.% W added, the grain size decreases considerably, while the number density and mean size of the oxide particles significantly increases and decreases, respectively. ∼63.5% and ∼96% of the oxide particles in SOC-5 and SOC-P3 (diameter